One excellent book on capability and SPC in general in John Oakland's
book "Statistical Process Control".  I'm in the UK and I'm not sure how
widely available it is.  John Oakland is the closest us Brits have to a
"Quality Guru"!!!

Neil Atkinson
Quality Manager
Stadium Electronics Controls

        ----------
        From:  Ronald J. Rhodes [SMTP:[log in to unmask]]
        Sent:  25 February 1999 14:12
        Subject:  Additional Cpk Questions

        Hi All,

        I have two questions for those of us that use Capability
Potential and
        Capability Performance Indices.

        1) When the mean of the data falls outside the specification
limits, is
        Cpk negative or zero?

        2) Does anyone have specific references that delve into the
details
        of Cp and Cpk?

        Thanks for your help.

        Ron Rhodes
        Conductor Analysis Technologies Inc.
        Phone: 732-424-1919
        Fax: 732-424-1886
        Email: [log in to unmask]
        Web: http://biz.swcp.com/cat

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################